The extended ROentgen Survey with an Imaging Telescope Array [1]}, [2]}, [3]} provides a valuable probe for determining the X-ray properties of galaxies.
eROSITA is the primary instrument on the Spectrum-Roentgen-Gamma (SRG) mission [4]}, which was successfully launched on July 13, 2019 [5]}.
The combination of WISE and eROSITA provides a complete census of MIR galaxies over a wide range of X-ray luminosities.
Because of the all-sky surveys, even if WISE MIR sources are not detected by eROSITA, an X-ray stacking analysis can still yield estimates of the typical X-ray properties of this possibly heavily obscured population, as successfully achieved with X-ray deep fields [6]}, [7]}.
